Electric heater



P. J. H. BERNARD. ELECTRIC HEATER. APPLICATION FILED MAY 29. I919.

1,356,335. Patented Oct. 19, 1920.

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ELECTRIC HEATER. ICATION FILED MAY 29 Patented Oct. 19, 1920.

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UNITED STATES PIERRE JOSEPH HENRI BERNARD,

Specification of Letters Patent.

PATENT OFFICE.

OF MGNTREAL, QUEBEC, CANADA.

HEATER.

Patented. Oct. 19, 1920.

Application filed May 29, 1919. Serial No, 300,654.

make and use the same.

The present invention relates to electric heaters for domestic and industrial purposes and the principal object is to provide a device capable of withstanding high temperatures.

A further object of the invention is to provide a heating unit consisting of a high resistance ribbon wound on a mica cylinder.

A further object of the invention resides in the provision of means for obviating the burning of the mica cylinder or the generation of certain gases, caused by the high temperature of resistance element.

With the above and other objects in view which will hereinafter appear as the description continues, the invention consists of the novel features of construction, combination and formation of parts, as will be hereinafter more fully described and particularly pointed out in the appended claims.

In the accompanying drawings has been shown a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details herein exhibited, but the right is hereby reserved to any changes, alterations or modifications to which recourse may be had that come within the scope of the claims without departing from the spirit of the invention or sacrificing the efiiciency of the same.

In the accompanying drawings:

Figure 1 is a top plan view of one of the heaters mounted in a boiler, showing portions broken away and in section;

Fig. 2 is a longitudinal cross sectional view of same; 1

Fig. 3 is a side elevational view of the heaters adapted for use as a radiator;

Fig. i is a plan view of a stove burner embodying in principle, my invention;

Fig. 5 is a cross section on line 5-5 of Fig. 1; and,

Fig. 6 is a sectional detail viewof a sad iron embodying my heating device.

Referring now more particularly to the accompanying drawings wherein like and corresponding parts are designated by similar reference characters throughout the several views.

Electrical heating devices while adapted for both domestic and industrial purposes,

are for the most part unsatisfactory, some not being sufiiciently robust in construction to withstand comparatively hard usage, or else the temperature obtained gradually falls too low to be of practical service and others have live parts that can be easily short circuited.

The device illustrated in the drawings comprises a hollow metal cylinder 1, having a closed lower end 2 and provided with eX- teriorly disposed screw threads 3 on the opposite end. 7

A heating element is adapted for location within said cylinder 1 and is'formed of a plurality of sheets of mica, mounted on a bolt 4, formed with a flange 5 at one end. When the mica sheets are assembled on bolt l, a washer 6 is disposed thereon and engages one surface of the flange 5 and when the required number of mica sheets has been assembled, I, then insert a washer 7, upon the said bolt and compress the sheets tightly together. The mica sheets comprising the insulating element are subjected to successive heatings and compressions, so that they are reduced to a solid constituency, and thereby all moisture, due to the. heating treatment and enormous pressure exerted thereupon, is eliminated.

This mica roll is then turned upon a lathe and spiral grooves 8, are formed on its outer peripheral surface and thereby providing spiral flanges 9, continuously encircling the roll from end to end.

A ribbon 10 of nichrome metal is continuously wound upon the insulating roll and being disposed in the continuous grooves 8, between the flanges 9, and the lower end 11, 0f the nichrome ribbon is attached by a screw 12 to the flange 5 of the bolt 4, while the opposite end is connected to a terminal 13, attached to the upper end of the mica 1 for the threaded end 16 of the said bolt 4. 3

This plug 14. is provided with exterior screw threads 17, and oppositely disposed openings for the reception of the insulating bushings 19 and 20, surrounding terminals 13 and 21. J

Terminal 21 is connected to bolt 4:, by a contact leaf 22, so that the electrical circuit between the plug 14: and the resistance ribbon "10, is established. Lead wires 23, are attached in any suitable manner to the terminal 13 and 21 and pass outwardly through a cap 24, which latter is provided with an interiorly screw threaded portion, adapted 'plug 14 is screwed into the wall and the heat generated within the cylinder by the resistance ribbon 10, is imparted to the water.

In Fig. 3, l have illustrated a plurality of my heating cylinders 1, mounted on a platform 26 and forming a radiator thereby.

For use as a burner element for stoves I provide a plurality of radially disposed cylinders 1, which latter are disposed just below the stove opening. 27, and vessels to be heated are cylinders.

Likewise the heating cylinder may be inserted into a sad iron as illustrated in Fig. 6 and in all the forms illustrated the construction is precisely the same, the only departure being in the manner of connecting the lead wires.

Having thus fully described my invention,

placed directly upon the heating what I claim as new and desire to secure by Letters Patent is:

1. An electric heater, comprising a casing adapted to be heated, an insulating member arranged in said casing, said member formed of compressed mica sheets having a helical flange formed on the peripheral surface thereof, a resistance wire wound on said member and interposed between said flange, a rod extending through said insulating member, a plug secured to one end of said rod, terminals mounted in said plug,

one end of said resistance wire connected to the rod and the other end connected to one of said terminals, a cap secured to said plug, and adapted to inclose the naked terminals and wires passing through said cap and leading to the source of electrical supply.

2. An electric heater, comprising a tubular casing adapted to be heated, a cylindrical insulating member arranged in said casing, said member formed of compressed mica sheets having a continuous spiral flange formed on the peripheral surface thereof, a ribbon resistance wire wound on said member and interposed between said flange, a conductive rod extending through said insulating member, a plug secured to one end of said rod, terminals mounted in said plug and insulated from the same, one end of said resistance Wire connected to the rod and the other end connected to one of the said terminals, a metallic plate arranged on said plug and insulated from the same thereof, said metallic plate connected at one end to said rod and the other end to a terminal, a cap securedto said plug and adapted to inclose the naked terminals, and wires passing through said cap, said wires leading to the source of electrical supply, substantiallyas shown and described. In witness whereof l have hereunto set my hand.

PIERRE JOSEPH HENRI BERNARD. 

